Update README.md

[yuku]

React::JSX::BabelTransformer::DEFAULT_TRANSFORM_OPTIONS is

{ blacklist: ['spec.functionName', 'validation.react', 'strict'] }

react-rails/lib/react/jsx/babel_transformer.rb

Line 6 in 290765a

DEFAULT_TRANSFORM_OPTIONS = { blacklist: ['spec.functionName', 'validation.react', 'strict'] }

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[yuku]

done

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[rmosolgo]

thanks!